/*
 * Copyright (c) 2011 Imre Fazekas.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the Brillien nor the names of its
 * terms and concepts may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.vii.brillien.core.management.io.jar;

import com.vii.streamline.services.IOServices;

import java.io.*;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

/**
 * JAR unpacker class to aid the component deployment process.
 * For every component copied to the Brillien's proper directory, the component archieve, formally a jar file must be extracted by using this class.
 */
public class JarUnpacker {

    /**
     * Get a content of a JAR file as a string
     * @param jarFile jar file to be processed
     * @param path path of the content to be retrieved
     * @return string representation of the content
     * @throws IOException
     */
    public static String unArchiveAsString(File jarFile, String path ) throws IOException {
        JarFile jar = new JarFile( jarFile );
        JarEntry entry = jar.getJarEntry( path );
        return IOServices.getStreamAsString( jar.getInputStream( entry ) );
    }

    /**
     * Extracts a jar file to a destination directory
     * @param jarFile jar file to be extracted
     * @param destinationDir destination directory
     * @throws IOException
     */
    public static void unArchive(File jarFile, File destinationDir ) throws IOException {

        //JarFile jar = new JarFile( jarFile );
        JarFile jar = new JarFile( jarFile );
        Enumeration<JarEntry> entries = jar.entries();
        while ( entries.hasMoreElements() ){
            JarEntry file = entries.nextElement();

            java.io.File f = new java.io.File( destinationDir.getAbsolutePath() + java.io.File.separator + file.getName());

            if ( file.isDirectory() ) { // if its a directory, create it
                f.mkdirs();
                continue;
            }
            else
                f.getParentFile().mkdirs();

            BufferedInputStream is = new BufferedInputStream( jar.getInputStream( file ) ); // get the input stream
            BufferedOutputStream bos = new BufferedOutputStream( new FileOutputStream( f ) );
            byte[] buff = new byte[ 2048 * 2048 ];
            int count = 0;
            while ( ( count = is.read( buff ) ) > 0 )
                bos.write( buff, 0, count );

            bos.close();
            is.close();
        }
    }

}

